Attaining A1-A2 for CCA allows you to deduct 2 bonus points
from your ELR2B2, while attaining B3-C6 for CCA allows you to
deduct 1 bonus point from your ELR2B2.
However, the bonus points only affect your NET aggregate score,
not your RAW score. It is your RAW score that determines your
eligibility for polytechnic/junior college/etc.